<div dir="ltr"><div>Just a thought: what about something more generalized & explicit, like a MultilineLiteral type (a.k.a. StaticString), and a String initializer with parameters for the options:</div><div><br></div><div>String.init(removeLeadingNewline: Bool = false, removeIndentation: Bool = false, _ mulitilineLiteral: MultilineLiteral)</div><div><br></div><div>let str = """</div><div> raw string; nothing changed</div><div>"""</div><div><br></div><div>let str2 = String(removeLeadingNewline: true, """</div><div> leading newline is removed, but indentation remains</div><div>""")</div><div><br></div><div>let str3 = String(removeIndentation: true, """</div><div> leading newline remains, but as much indentation as possible is removed</div><div>""")</div><div><br></div><div><br></div><div>(I'm not a fan of the trailing close-paren, but can't really think of a way around it. Maybe an exception like trailing-closure syntax for trailing-multiline-literals?)</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div>Jacob<br></div></div></div></div>
<br><div class="gmail_quote">On Thu, Dec 10, 2015 at 10:38 PM, Jason Dusek via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Yeah, I can't say I am totally committed to the fourth one.</div><div class="HOEnZb"><div class="h5"><br><div class="gmail_quote"><div dir="ltr">On Thu, 10 Dec 2015 at 22:34 Travis Tilley <<a href="mailto:ttilley@gmail.com" target="_blank">ttilley@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:verdana,sans-serif">I had been operating on the assumption that a leading blank line would be stripped if present, since the syntax in code would look much cleaner, but a trailing line would not since it would likely be intentional. I guess that's another detail that would need to be fleshed out if we decide to go with triple quote syntax (which, at this point, isn't a given... chris lattner brings up some very good points that might require more involved, potentially heredoc-like, syntax to solve).</div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">Your fourth rule, however, I don't agree with at all. It should be obvious from where you place the final quotes whether or not the string includes a trailing newline. Just like in ruby, I believe in and value the principle of least surprize. </div></div><div dir="ltr"><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">- Travis Tilley</div></div><div dir="ltr"><div style="font-family:verdana,sans-serif"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 11, 2015 at 1:04 AM, Jason Dusek <span dir="ltr"><<a href="mailto:jason.dusek@gmail.com" target="_blank">jason.dusek@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><span><p style="margin:1.2em 0px!important">On Thu, 10 Dec 2015 at 21:45, Travis Tilley via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</p>
<p style="margin:1.2em 0px!important"></p><div><p></p><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:verdana,sans-serif">The ruby <<- heredoc syntax, unlike the << heredoc syntax, will strip indentation if necessary. Technically, it searches for the "least indented line" in the whole string, and removes exactly that amount from each line. So yes, the indentation problem -is- solved in ruby (though it might break entirely if you have empty lines, since the least indented line has no indentation).</div></div></blockquote><p></p></div><p style="margin:1.2em 0px!important"></p>
</span><p style="margin:1.2em 0px!important">To my mind, the rules should be:</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">The indentation level is set from the least indented line that is not the first line and is not empty.</li>
<li style="margin:0.5em 0px">A leading empty line is removed.</li>
<li style="margin:0.5em 0px">The leading line, if there is any text in it, is not subject to de-indentation.</li>
</ol>
<p style="margin:1.2em 0px!important">I genuinely believe these three rules taken together address all the errors and infelicities to which triple quotes and HEREDOCs subject us. Here are some examples:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">text = <span style="color:rgb(221,17,68)">"""
Some
Features
Are
Discussed
"""</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (1): The indentation is taken from the third line below `text`, so it's 2.</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (2): First line is: "\n" so it is removed.</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (3): No effect.</span>
text = <span style="color:rgb(221,17,68)">""" Some
Features
Are
Discussed
"""</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (1): The indentation is taken again from the line reading "Features". Here it is 10.</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (2): No effect.</span>
<span style="color:rgb(153,153,136);font-style:italic"># From (3): The leading whitespace in ` Some` is preserved.</span>
</code></pre>
<p style="margin:1.2em 0px!important">Do you all think these rules pass muster?</p>
<p style="margin:1.2em 0px!important">A fourth rule — one which seems advisable but also less necessary than the others — is that a string constructed in this way always ends with a newline. It is a rule that perhaps leads to surprises and inconsistencies.</p>
<p style="margin:1.2em 0px!important">Best Regards,</p><p style="margin:1.2em 0px!important">Jason</p>
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</div></div></blockquote></div>
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